How to open .jpg file with Minimagick? - ruby-on-rails

Question

I have an error with MiniMagick during my "after_upload" in my image_concern.rb
My code makes the image that is poster be converted to jpg. Then it will take the file which is in / tmp and will modify this file to have it also in smaller to display it for later. But I have an error during this step:
`mogrify -resize 360x200^ -gravity Center -crop 360x200+0+0 /tmp/RackMultipart20200211-5215-1lxtqf1.png` failed with error: mogrify: unable to open image '/tmp/RackMultipart20200211-5215-1lxtqf1.png':
It tries to open this file in .png but it is in jpg in my tmp /. How to say that it opens this file but not in png but in jpg. Thank you
This is my after_upload code:
def #{field}_after_upload
path = #{field}_path
options = #{options}
if #{field}_file.respond_to? :path
dir = File.dirname(path)
FileUtils.mkdir_p(dir) unless Dir.exist?(dir)
image = MiniMagick::Image.new(#{field}_file.path) do |b|
if options[:resize].ends_with?('!')
b.resize '#{options[:resize].delete('!')}^'
b.gravity 'Center'
b.crop '#{options[:resize].delete('!')}+0+0'
else
b.resize '#{options[:resize].delete('!')}\>'
end
end
image.format 'jpg'
image.write path
if options[:formats]
options[:formats].each do |k, v|
image = MiniMagick::Image.new(#{field}_file.path) do |b|
b.resize "\#{v}^"
b.gravity 'Center'
b.crop "\#{v}+0+0"
end
image.format 'jpg'
image.write path.gsub('.jpg', "_\#{k}.jpg")
end
end
end
end
The bug starts from "if options[:formats]"
Thank you !